Add time:08/13/2019         Source:sciencedirect.com

A Cu(OTf)2-catalyzed and TsNCO-mediated three-step tandem synthesis of 9-arylfluorenes were developed from biphenyls and aryl aldehydes, by which the electron-poor 9-aryl substituted fluorenes were synthesized smoothly. Its success is mainly attributed to use an anhydrous synthesis of N-tosyl arylaldimines as a key step, which was achieved in situ from the reaction of TsNCO and aryl aldehydes.

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